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Ну это может даст скорости в 1,5 узла при идеальном стечении обстоятельств. Скорее даже скорость течения не компенсирует.

Для таких целей парус все же безальтернативен - надо поставил, не надо убрал и руки всегда освободить можно. А кайт не собрать, не разобрать особенно на воде.